Задача 4

#include <stdio.h>
#include <math.h>

int main() {
    int a[10] = {0}, res[10] = {0};
    for (int i = 0; i < 10; ++i)
        scanf("%d", &a[i]);
    for (int i = 0; i < 10; ++i)
        res[i] = abs(a[i]/10 - a[i]%10);
    for (int i = 0; i < 10; ++i)
        printf("%2d ", res[i]);
    return 0;
}